\n\n";
if(isset($_GET["operation"]) && isset($_GET["t1"]) && isset($_GET["t2"]) ) {
$op = $_GET['operation'];
$t1 = $_GET['t1'];
$t2 = $_GET['t2'];
if($op === "plus")
echo ($t1 + $t2);
else if($op === "minus")
echo ($t1 - $t2);
else if($op === "times")
echo ($t1 * $t2);
else if($op === "divide" && abs($t2) > 1e-10)
echo ($t1 / $t2);
else
echo 'expr_get.php?operation=(plus|minus|times|divide)?t1=(float)?t2=(float)';
} else
echo 'expr_get.php?operation=(plus|minus|times|divide)?t1=(float)?t2=(float)';
echo "\n";
?>